| Views | |
| Critical depth as a result of system analysis of mine working | 75 |
| November 2012 | December 2012 | January 2013 | February 2013 | March 2013 | April 2013 | May 2013 | |
| Critical depth as a result of system analysis of mine working | 4 | 8 | 2 | 7 | 3 | 5 | 4 |
| Views |
| Views | |
| United States of America | 36 |
| Czech Republic | 27 |
| Poland | 5 |
| Japan | 4 |
| Ukraine | 2 |
| Russian Federation | 1 |
| Views | |
| Redwood City | 15 |
| Sayreville | 9 |
| Mountain View | 5 |
| Warsaw | 5 |
| Seattle | 3 |
| Ostrava | 2 |
| Redmond | 2 |